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Analysis of the Magnetic Noise for Large Power Induction Motors at Loading Operation  

Hong, Gil-Dong (현대중공업 전기전자시스템사업부)
Chun, Tae-Won (울산대 전기전자정보시스템공학부)
Lee, Hong-Hee (울산대 전기전자정보시스템공학부)
Kim, Heung-Gun (경북대 전자전기공학부)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.58, no.3, 2009 , pp. 509-515 More about this Journal
Abstract
When a squirrel cage induction motor is loaded, the magnetic noise can increase depending on the load current. It is due to the variation of air gap harmonic fluxes from the rotor current induced by loading. This unfavorable noise can be anticipated by analysing the radial force waves in the air gap, the mode shapes of them, and stator core natural frequencies at each mode. With the experimental tests with the different rotor slot numbers, the variation of magnetic noise depending on the load current is studied and the method to reduce the magnetic noise is suggested with the newly developed magnetic noise analysis program.
Keywords
Electromagnetic noise; Flux density; Induction motor; Rotor slot;
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